Electromagnetic flowmeter M910
Operation manual
17
Note 2: Active impulse output uses the power supply of the current output. Total current take-off from this power
supply (terminal nr. 1) must be less than 40 mA. Active impulse output is galvanically connected to
current output.
4.3.4 Status output
Status output is formed by relays. Maximum switched voltage is 100 V. Maximum switched current should not
exceed 500 mA. First output is on terminal 8, second output is on terminal 5 and 7 (internally connected).
Example of status output connection:
For more information about status output see chapter “
Input and outputs configuration
”.
Note 1: Frequency, impulse and status outputs are galvanically connected to each other and galvanically isolated
from other electronic circuits.
Note 2: Active status output uses the power supply of the current output. Total current take-off from this power
supply (terminal nr. 1) must be less than 40 mA. Active status output is galvanically connected to the
current output.
4.3.5 PLC digital input
The digital input is activated with a DC voltage between 5 and 30 V (positive or negative). The digital input is
between terminals 9 and 10.
For more information about digital input see chapter “
Input and outputs configuration
”.
Note: PLC digital input is galvanically isolated from other electronic circuits.
4.3.6 Serial port RS485
The serial port RS485 is assigned for online communication between flowmeter and computer. It is suitable for real
time flowmeter monitoring. In contrast to the RS232 serial port, which is suitable for one-shot configuration or
calibration of the flowmeter. The RS485 can be connected to up to 16 flowmeters together and the total connection
length of all wires can be up to 800 meters. Positive output (A) is on terminal 11, negative output (B) on terminal
12.
Example of three flowmeters and one computer interconnection:
Passive
status output connection
Active
status output connection